refactor: replace Task tool with Agent tool and fix schema compliance

## Task -> Agent Replacement
- Replace all Task({}) calls with Agent({}) across .claude/ directory
- Update allowed-tools declarations from Task to Agent
- Update documentation references from "Task tool" to "Agent tool"

## Schema Compliance Fixes

### Agent Schema
- Add missing required `description` parameter in 6 files
- Add missing `run_in_background: false` for subagent calls
- Add missing `subagent_type` parameter

### AskUserQuestion Schema
- Fix issue-manage/SKILL.md: reduce options from 5 to 4 (max allowed)

### SendMessage Schema
- Fix team-worker.md: use correct params (type, content, summary)
- Remove invalid `team_name` parameter

### TaskCreate/TaskUpdate Schema
- Remove invalid `blockedBy`, `owner`, `status` from TaskCreate calls
- Use separate TaskUpdate calls for dependencies and ownership
- Fix TaskUpdate syntax to use object parameter

### TeamDelete Schema
- Remove parameters from TeamDelete() calls (should be no params)

### TaskOutput Schema
- Fix Python-style syntax to JavaScript object syntax

## Files Changed
- 146 files updated across commands/, skills/, skills_lib/, agents/

.claude/commands/workflow/integration-test-cycle.md

@@ -2,7 +2,7 @@
 name: integration-test-cycle
 description: Self-iterating integration test workflow with codebase exploration, test development, autonomous test-fix cycles, and reflection-driven strategy adjustment
 argument-hint: "[-y|--yes] [-c|--continue] [--max-iterations=N] \"module or feature description\""
-allowed-tools: TodoWrite(*), Task(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*), Bash(*), Edit(*), Write(*), Skill(*)
+allowed-tools: TodoWrite(*), Agent(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*), Bash(*), Edit(*), Write(*), Skill(*)
 ---
 
 ## Auto Mode
@@ -209,7 +209,7 @@ Unified integration test workflow: **Explore → Design → Develop → Test →
 1. **Codebase Exploration via cli-explore-agent**
 
 ```javascript
-Task({
+Agent({
   subagent_type: "cli-explore-agent",
   run_in_background: false,
   description: `Explore integration points: ${topicSlug}`,
@@ -391,7 +391,7 @@ Also set `state.json.phase` to `"designed"`.
 1. **Generate Integration Tests via @code-developer**
 
 ```javascript
-Task({
+Agent({
   subagent_type: "code-developer",
   run_in_background: false,
   description: `Generate integration tests: ${topicSlug}`,
@@ -435,7 +435,7 @@ Also set state.json "phase" to "developed".
 2. **Code Validation Gate via @test-fix-agent**
 
 ```javascript
-Task({
+Agent({
   subagent_type: "test-fix-agent",
   run_in_background: false,
   description: `Validate generated tests: ${topicSlug}`,
@@ -605,7 +605,7 @@ After each iteration, update the `## Cumulative Learnings` section in reflection
 
 **@test-fix-agent** (test execution):
 ```javascript
-Task({
+Agent({
   subagent_type: "test-fix-agent",
   run_in_background: false,
   description: `Execute integration tests: iteration ${N}`,
@@ -637,7 +637,7 @@ For each failure, assign:
 
 **@cli-planning-agent** (failure analysis with reflection):
 ```javascript
-Task({
+Agent({
   subagent_type: "cli-planning-agent",
   run_in_background: false,
   description: `Analyze failures: iteration ${N} - ${strategy}`,
@@ -676,7 +676,7 @@ Analyze test failures using reflection context and generate fix strategy.
 
 **@test-fix-agent** (apply fixes):
 ```javascript
-Task({
+Agent({
   subagent_type: "test-fix-agent",
   run_in_background: false,
   description: `Apply fixes: iteration ${N} - ${strategy}`,